People also don't have a lot of time outside of work, and have other hobbies /people that they want to spend time on/with. And it's going to take under a year at most before they are able to make any meaningful contributions if they are learning to code for the first time.

And people who do know how to code most likely do it as a day job and don't want to do any programming outside of it to avoid burnout.

There are a lot of legitimate reasons as to why people can't always contribute.

FOSS is eventually the better option, but that is a long wait.